Azizah, Suti Mega Nur, et al. “Enhancing Network Security Skills Using a Problem-Based Learning Approach in Cisco Packet Tracer Simulation Practices”. Edunesia : Jurnal Ilmiah Pendidikan, vol. 6, no. 3, Aug. 2025, pp. 1585-96, doi:10.51276/edu.v6i3.1268.